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Already been through this myself. The iMac is a closed machine by nature. Although in saying that, you may be aware of the new iMacs just released, with the option of the 8800 graphics card on the top model. On a recent telephone conversation with apple support, the guy seemed to think that you could upgrade to the spec of that latest Mac.

As you have the 20inch model however, I'm really not sure, as this high spec option is available on the new 24inch.

Because that's not my question, I want to know what can be upgraded on the specfic iMac I have, for future reference

mreg376 says: Ummm, why don't you start by telling us what you need upgraded?

Thanks JohnTheMacGeek and slinki for your replys, this is excatly what I'm wanting to know

The new 8800 graphics card would be nice to have if I started to play games on my iMac, like the SIMS. But I have all the SIMS for windows so might just fix my old HP desktop (NZ$250.00) and use that for SIMS.

I think the graphic work I do isn't enough to worry about upgrading my graphics card, if that could be done.

As for the RAM and hard drive, that's easier enough to get and do.
thanks